Project information:
Name: Tachidesk-VaadinUI
Homepage: https://github.com/Suwayomi/Tachidesk-VaadinUI
License: [MIT license]
Upstream has been contacted: https://github.com/Suwayomi/Tachidesk-VaadinUI/issues/82
The Developer seems have a problem to upload it to Flathub and it will be great if anyone can help the developer